• The tapped density is an increased bulk density attained after mechanically tapping a container containing the powder sample.Tapped density is obtained by mechanically tapping a graduated measuring cylinder or vessel containing a powder sample.After observing the initial powder volume or weight, the measuring cylinder or vessel is mechanically tapped,and volume or weight readings are served. The mechanical tapping is achieved by raising the cylinder or vessel and allowing it to drop under its own weight a specified distance by either of three methods as described in usp chapter 616.Devices that rotate the cylinder or vessel during tapping may be preferred to mimimize any possible separation of the mass during tapping down.

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